<template>
  <div class="box">
    <div class="left">
      <RouterView name="left"/>
    </div>

    <div class="right">
      <!-- 不设置 name 则默认为 default -->
      <RouterView />
    </div>
  </div>
</template>

<style>
.box {
  display: flex;
  height: 100vh;
}

.left {
  width: 200px;
  background-color: green;
}

.right {
  flex: 1;
  background-color: pink;
}
</style>